We martians had it all figured,a series of canalstraversing the whole planet.A way to move produce& also store energy.Then the nosy earthlingswith their accurate telescopes indulged,so everything went undergroundlike veins in all directions.The planet surfacestill needed to look uninhabitable:all done with cosmic mirrors& a bunch of desolate lookingdesert billboards purchasedwholesale by one of our moreastral agents in Arizona.